Telephone-receiver.



A. RECTOR. TELEPHONE RECEIVER. APPLICATION FILED MAR.13, 190s.

Patented Mar. 16, 1909.

UNITED STATES PATENT oFFIcE.

ALCORN REOTOR, OF NEW YORK, N.'Y ASSIGNOR TO REOTOR HELP-A-PHONECOMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

TELEPHONE-RECEIVER.

Specification of Letters Patent.

Patented March 16, 1909.

Application filed March 13, 1908. Serial No. 420,855.

T 0 all whom it may concern:

Be it known that I, ALCORN Rncron, of the city, county, and State ofNew. York, have invented a new and useful Improvement inTelephone-Receivers, of which the following is a full, clear, and exactdescription.

My invention relates to improvements in telephone receivers, and theobject of my invention is to produce a receiver which will transmitreceived sounds better, softer, and yet clearer than the ordinarytelephone receivers, and further to produce an im rove ment in the formof a hollow or tubu ar ex-. tension of the end of the receiver whichcomes next the car so that the novel feature can be readily applied toexisting receivers, if desired.

In Letters Patent of the United States #847,691, dated March 19th, 1907,I have shown a ring interposed between the end of a receiver and the earpiece, and with a tube extending from the central hollow part ofthereceiver to a second ear piece, so that the two car ieces may beapplied to the two cars of the bearer and the sound transmitted to bothears. In experimenting with this form of receiver or receiverattachment, I have discovered that I get much better clearer, softer,and pleasanter tones from the receiver where the hollow or tubularextension is used through which the sound is transmitted from thediaphragm to the car, even though there is no connection between thesaid extension and the second ear piece. I am not sure as to the exactreason why the sound is so much better, but exhaustive experiments haveshown that there is no question whatever but that by extending the soundtransmitting or hollow portion of the receiver, preferably in the formof a tube, to some little istance from the diaphragm before it reachesthe ear, the above noted effect is had. Obviously the mechanical meansfor carrying this idea into effect can be varied somewhat, but one thinis essential, and that is to have an essentially tubular portion inclose contact with the diaphragm and extending to a considerabledistance from the diaphragm to the ear piece. This extension and the earpiece may be integral, but I prefer to have the extension in ring formso that it can be screwed to the end of the ordinary telephone receiverand have it adapted at its outer end to receive the customary ear piece.

part 16. This Reference is to be had to the accompanying drawingsforming apart of thisspecification, in which similar referencecharactersindicate corresponding parts in all the views.

Figure 1 is a broken sectional view of a telephone receiver showing myimprovements, and Fig. 2 is a similar view to Fig. 1 but shows thehollow extension of the sound tube in the form of a horn or hollow coneso as to get a megaphone effect.

The receiver 10 is the customary telephone receiver and may be of anyusual kind, having the threaded outer end 11 and the usual diaphragm 12.In ordinary receivers the ear piece 13 is screwed directly to the end ofthe receiver body, so that the sound orifice of the ear piece is closeup against the diaphragm. I have found, however, that by interposing aring 14 between the ear piece andthe body of the receiver, and providinga hollow extension or sound tube 16 between the diaphragm and theorifice of the ear piece, the sounds coming through thevreceiver aremuch pleasanter to the car, are more distinct, and that the disagreeablesnapping and buzzing often noticeable in telephone receivers, is in agreat measure done away with.

The essential feature of this discovery or invention lies in the part16, but this can be most conveniently applied by having it formed on aring 14 which has a threaded flange 15 adapted to screw to the flpart 11of the receiver. In Fig. 2 I have s own this central portion 16 slightlyexpanded at its outer end so as to get a little augmentation of sound.Obviously the'ring 14 with its tube 16 and the ear piece 13 can be madeall in one piece where new receivers are being made, but there is nospecial advantage in this, as the parts are rather more easily madeseparately, and for application to old receivers or receivers alreadymade, it is much better to have the interposed ring. 7

The drawing shows a chamber surrounding the hollow extension 16 but thisdoes not seem to affect the result. In my former invention abovereferred to, I had a branch tube connecting with the part 16 and leadingthrough the medium of a flexible tube to a second ear piece, but in thiscase I have no outlet for sound except through the arrangement as beentried on many different instruments, and there is no question whateverbut'that the better effect is had by its use, and apparently this iscaused by getting the ear piece farther from the diaphragm and rovidinga tubular or hollow portion in WhlOl-l the sound Waves are nary earpiece, the said ring being adapted to fasten to the receiver over thediaphragm, having its out'erend screw threaded to reeei-ve the usual earpiece, and having a central sound bore corresponding with the bore ofthe ear piece.

2. The combination With the usual telephone having the customary earpiece, of a detachable ring secured to the end of the telephone receiverand having its outer end adapted to receive the customary ear piece ofthe receiver", said ring having a sound bore extending centrally throughit from the receiver diaphragm and registering with the sound bore ofthe ear iece.

ELCORN HECTOR.

Witnesses WARREN B. HUTonINsoN, WILLIAM S. DENIsoN.

